Method of and apparatus for printing and waxing paper in one operation



Feb. 10, 1931. c, E 1,792,414

METHOD OF AND APPARATUS FOR PRINTING AND WAXING PAPER IN ONE OPERATION Filed April 3, 1928 lMPRES 5 ION 67L INDER'S A, I i a J I L ATIURNILY.

Patented Feb. 10, 1931 UNITED STATES PATENT OFFICE HARRY G. COLE, OF PHILADELPHIA, PENNSYLVANIA METHOD 01 AND APPARATUS FOR PRINTING AND WAXING PAPER IN ONE I OPERATION Application filed April 3, 1928. Serial No. 267,048.

This invent-ion, stated in its broadest terms, relates to a method of printing and waxing paper and has more particular relation to the provision of a method of this kind 5 in which the printing and waxing is simultaneously accomplished.

This waxed and printed paper is employed to wrap bread, cakes, doughnuts, candy, and other commodities, and it is not only desirable to have the paper waxed but desirable to have advertising matter thereon. As at present commercially practiced this waxing and printing is not accomplished in one operation. What is being done, commercially considered, is to unroll the web of paper from-its complemental roll, properly print the paper, and then rewind the printed web upon its roll, and permit the ink to dry. The printed paper is then unrolled from its roll and passed through the bath of wax, after which the excess of wax is wiped OE and the paper again rewound.

The leading object of the present invention is to overcome the above described disadvantageous features and provide a'method wherein the method of printing and waxing is reduced to a single operation, and wherein it is unnecessary to unwind and rewind as at present commercially practiced.

A further object is to provide a method in which simplicity is paramount, and from which more eificient results can be obtained because of the single operation.

The invention consists of the method hereinafter described and finally claimed.

For the purposes of illustrating the method of the present invention, an isometric view of the apparatus employed is shown in the drawings, in which similar numerals of reference indicate corresponding parts.

According to the present invention the aper to be printed and waxed is passed etween first printing and impression cylinders. With the printing completed both the printed side of the paper and the unprinted side of the paper are subjected to a spray of wax, and thereafter the waxed paper is passed over the heated roll. The printed and waxed paper is then caused to travel for an 60 appreciable distance before it is subjected to chilling rolls, and upon being chilled is immediately wound upon its proper roll. This operation is continuous and uninterrupted from the time the paper is passed to the printing cylinders until it is wound upon its roll.

Taking up now the drawings in detail, whlch as before stated are merely for illustrative purposes and are diagrammatic in form, the reference numeral 1 designates the web of paper to be printed. This web of paper 1s passed between a series of printing cylinders 2 and impression cylinders 3. .The number of printing cylinders and impress1on cylinders, of course, depends upon the character of the work to be .done. Having properly printed the web of paper 1 the same is passed between a pair of nozzles 4 and 5 for the spraying of a wax composition upon each side of the web of paper. The paper, which has now been printed and waxed, 15 passed to a heated roll designated 6. The roll may be heated in any desired way, as for instance by steam, gas, or electrlcity. In the connection it is to be noted that the printed side, of the web of paper does not come in direct contact with the roll ltself, but rather the under, unprinted side of the web of paper makes direct contact with the heated roll.

The web of paper now passes to the chilled u rolls and 8 with the printed side of the paper stlll uppermost. In this connection it is to be noted that between the heated roll and the first chilled roll there is considerable space so that in its travel the ink upon the printed web may have opportunity to partially dry. Of course, the chilled rolls assist in drying of the printing. Finally the web of paper is wound upon the roll 9. By this continuous, uninterrupted operation the step of immersing a printing roll in a wax bath is entirely dispensed with. This is part1cularly advantageous since the immersing of a prlnting roll vin a wax bath tends to cause the printing to bleed or run in the wax bath. A

It will be apparent that any suitable forms of wax spray nozzles may be employed and in practice the melted wax is discharged Len upon the moving web 1 at about the temperature of 175 F., it being of course apparent that suitable controlling devices (not shown) may be employed to regulate'the flow of the melted wax to the nozzles 5, so that only a thin film of melted wax of the desired thickness may be deposited on both sides of the printed'web, as it travels towards and over the heated roll. The heated roll 6 is preferably heated to about the temperature of 175 F. and the chilling rolls 7 and 8 are cooled to about 25 F. I have deemed it unnecessary to show in detail the means for heating the roll 6 as the same may be heated by a gas flame or by an electric resistance coil or other means positioned at any desired point with respect to the heating roll and the cooling devices for the chilled rolls 7 and 8 may also be of any conventional type.

It will thus be seen that I first print on the outer side of the web, paper or fabric 1, and then simultaneously spray both sides of the paper with wax from the nozzles 4 and 5 subsequent to the printing operation, after which the paper 1 is heated on one, or the inner side only thereof by the roll 6. This serves to dry the ink on the outer side of the web and to melt the wax on both sides thereof, to secure a uniform, even waxed surface. The wax is obviously afforded time to spread and set during the interim between the travel of the paper 1 from the roll 6 to the initial chilling roll 7 which serves to chill and solidify the wax on the inner blank surface of the paper or web 1, as well as the opposite printed and waxed surface, the wax on the outer printed surface of said web being finally chilled by the second chilling roll 8 before the web is ultimately wound on the roll 9.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire to present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In an apparatus of the character described, means for printing on one side of a web of paper, oppositely disposed units for simultaneously waxing both sides of said printed web, by sprayin thereon a wax composition, means for appfving heat directly to the unprinted side only of said web, means for first chilling the unprinted surface of said printed and waxed web, and means for next chillin the printed waxed side of said web.

2. The hereindescribed method of printing and waxing a web, which consists in first printing on one side of said web, next simultaneously spraying both sides of said web with wax subsequent to the printing operation, next applying heat directly to the blank, unprinted surface only of said web, next initially chilling said blank, waxed unprinted surface of said web, next chilling the printed surface of said web and lastly winding said printed, waxed and chilled web upon a roll.

3. An apparatus for printing and waxing a web comprising means for printing on one side of said web, means for spraying both sides of said web with wax subsequent to the printing operation, means for applying heat directly to the blank, unprinted side only of said web, means for initially chilling said blank, unprinted side of said web, means for next chilling the printed side of said web and means for winding said printed, waxed and chilled web into a roll.

HARRY O. COLE. 

